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COMMITMENTS AND CONTINGENCIES (Details)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2006
Oct. 31, 2003
USD ($)
gal
Jul. 31, 2016
item
Oct. 31, 2017
USD ($)
MMBTU
mi
item
bu
gal
Oct. 31, 2016
USD ($)
bu
Oct. 31, 2015
USD ($)
Oct. 31, 2007
USD ($)
Oct. 31, 2006
USD ($)
Ethanol Marketing Agreement With Eco-Energy, Inc. [Member]                
Loss Contingencies [Line Items]                
Fees and commissions       $ 1,159,000 $ 1,256,000 $ 1,234,000    
Corn Oil | RPMG, Inc. Marketing Agreement [Member]                
Loss Contingencies [Line Items]                
Fees and commissions       $ 176,000 $ 166,000 125,000    
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Forward Cash and Basis Contracts Purchase Commitments [Member]                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       3,041,000        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Marketing Agreement With Eco-Energy, Inc. [Member]                
Loss Contingencies [Line Items]                
Equipment Lease, Quantity | item       43        
Number of terms agreement automatically renews | item     3          
Term of renewal periods     3 years          
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Marketing Agreement With Eco-Energy, Inc. [Member] | Minimum                
Loss Contingencies [Line Items]                
Written notice for termination of agreement     90 days          
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Unrelated Company Construction And Maintenance Agreement [Member]                
Loss Contingencies [Line Items]                
Distance of natural gas pipeline | mi       9.5        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Unrelated Company Construction And Maintenance Agreement [Member] | Minimum                
Loss Contingencies [Line Items]                
Minimum volume of natural gas Company to receive annually | MMBTU       1,400,000        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       1,495,000 5,220,000      
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Ethanol Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | gal       420,000        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Distillers' Grains | RPMG, Inc. Marketing Agreement [Member]                
Loss Contingencies [Line Items]                
Initial term       1 year        
Fees and commissions       $ 276,000 $ 335,000 421,000    
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Distillers' Grains | RPMG, Inc. Marketing Agreement [Member] | Minimum                
Loss Contingencies [Line Items]                
Written notice for termination of agreement       90 days        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Oil | RPMG, Inc. Marketing Agreement [Member]                
Loss Contingencies [Line Items]                
Initial term       1 year        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Corn Oil | RPMG, Inc. Marketing Agreement [Member] | Minimum                
Loss Contingencies [Line Items]                
Written notice for termination of agreement       90 days        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Corn Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       1,295,000 1,920,000      
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Ethanol Contracts                
Loss Contingencies [Line Items]                
Value of commitment       $ 18,889,000        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Ethanol Contracts | Product                
Loss Contingencies [Line Items]                
Concentration percentage       56.00%        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Distillers' Grains                
Loss Contingencies [Line Items]                
Value of commitment       $ 1,459,000        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Distillers' Grains | Product                
Loss Contingencies [Line Items]                
Concentration percentage       92.00%        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Corn Oil                
Loss Contingencies [Line Items]                
Value of commitment       $ 423,000        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Short/Sale position | Corn Oil | Product                
Loss Contingencies [Line Items]                
Concentration percentage       48.00%        
Granite Falls Energy, LLC Excluding Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       200,000 3,300,000      
Heron Lake BioEnergy, LLC | Corn Forward Cash and Basis Contracts Purchase Commitments [Member]                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       1,769,000        
Heron Lake BioEnergy, LLC | Ethanol Marketing Agreement With Eco-Energy, Inc. [Member]                
Loss Contingencies [Line Items]                
Number of terms agreement automatically renews | item     3          
Term of renewal periods     3 years          
Percentage of ethanol and distillers grains products produced by the entity to be purchased, marketed and resold by Gavilon       100.00%        
Heron Lake BioEnergy, LLC | Ethanol Marketing Agreement With Eco-Energy, Inc. [Member] | Minimum                
Loss Contingencies [Line Items]                
Written notice for termination of agreement     90 days          
Heron Lake BioEnergy, LLC | Northern Border Pipeline Company [Member]                
Loss Contingencies [Line Items]                
Distance of the natural gas pipeline from the ethanol plant | mi       16        
Heron Lake BioEnergy, LLC | Water supply development and distribution agreement                
Loss Contingencies [Line Items]                
Term of agreement   15 years            
Initial volume per minute of capacity that is available from the well for which the entity has exclusive rights (in gallons) | gal   6,000            
Percentage of City's water well bond payments HLBE will pay   50.00%            
City's water well bond payments   $ 735,000            
Administrative fee to be paid as water usage fees (as a percent)   5.00%            
Administrative fee   $ 594,000            
Percentage of profit to be paid as water usage fees   10.00%            
Assessment   $ 367,000            
Operating and administrative/maintenance expenses paid   $ 12,000            
Heron Lake BioEnergy, LLC | Water treatment agreement                
Loss Contingencies [Line Items]                
Term of agreement 30 years              
Assessment             $ 500,000 $ 3,550,000
Operating and administrative/maintenance expenses paid       $ 92,000 $ 24,000 57,000    
Heron Lake BioEnergy, LLC | Corn Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       1,120,000 4,285,000      
Heron Lake BioEnergy, LLC | Ethanol Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | gal       420,000        
Heron Lake BioEnergy, LLC | Distillers' Grains | Gavilon Ingredients, LLC. Agreement [Member]                
Loss Contingencies [Line Items]                
Initial term       6 months        
Fees and commissions       $ 268,000 $ 283,000 $ 308,000    
Heron Lake BioEnergy, LLC | Distillers' Grains | Gavilon Ingredients, LLC. Agreement [Member] | Minimum                
Loss Contingencies [Line Items]                
Written notice for termination of agreement       60 days        
Heron Lake BioEnergy, LLC | Corn Oil | RPMG, Inc. Marketing Agreement [Member]                
Loss Contingencies [Line Items]                
Initial term       1 year        
Heron Lake BioEnergy, LLC | Corn Oil | RPMG, Inc. Marketing Agreement [Member] | Minimum                
Loss Contingencies [Line Items]                
Written notice for termination of agreement       90 days        
Heron Lake BioEnergy, LLC | Short/Sale position | Corn Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       905,000 1,185,000      
Heron Lake BioEnergy, LLC | Short/Sale position | Ethanol Contracts                
Loss Contingencies [Line Items]                
Value of commitment       $ 18,414,000        
Heron Lake BioEnergy, LLC | Short/Sale position | Ethanol Contracts | Product                
Loss Contingencies [Line Items]                
Concentration percentage       52.00%        
Heron Lake BioEnergy, LLC | Short/Sale position | Distillers' Grains                
Loss Contingencies [Line Items]                
Value of commitment       $ 2,006,000        
Heron Lake BioEnergy, LLC | Short/Sale position | Distillers' Grains | Product                
Loss Contingencies [Line Items]                
Concentration percentage       27.00%        
Heron Lake BioEnergy, LLC | Short/Sale position | Corn Oil                
Loss Contingencies [Line Items]                
Value of commitment       $ 763,000        
Heron Lake BioEnergy, LLC | Short/Sale position | Corn Oil | Product                
Loss Contingencies [Line Items]                
Concentration percentage       90.00%        
Heron Lake BioEnergy, LLC | Long/Purchase position | Corn Contracts                
Loss Contingencies [Line Items]                
Quantity of commitment | bu       215,000 3,100,000